I find it a bit funny to see the G34/G35 not on the IPSC Production list but the XD is just listed simply as "XD".

I found the XD easier to reload than Glocks, hence why I bought it. The 4" or 5" model is basically the same, a little more sight radius but I don't think it helps much. Both models have the same accuracy, the extra inch doesn't help anything, at least in the XD.